Hi, Rusty....I do not have a prop installed, as it would blow everything out of the garage.  I have had the engine up to around 4500 rpm at around 1/3 to 1/2 throttle, but that's without the load from a prop. I am hoping to get the airplane to the airport in the next week or two and install the prop, then see what kind of run-up rpm's I get.  I talked to the guy who sells the new Mistral rotary engine, and he said that my intake is very similar to what they were using.  They are presently changing it to relocate the injectors very close to the intake of the engine, however it will still have the wrap-around intake like we have with the throttlebody on the cold side of the engine.  I have a picture that he sent to me if you are interested.  Paul Conner

 

 

Paul, I hope you are only just guessing that the engine was at 1/3 - 1/2 throttle at 4500 rpm & no load.   If running well, the engine should just about destroy itself at > 10,000 rpm with no load.  Did you happen to notice the manifold pressure?  I'd guess that it would be at about the same as idle (12 - 13 " Hg) with no load.

 

Tracy